EP2518341B1 - Sliding bearing and sliding bearing assembly - Google Patents

Sliding bearing and sliding bearing assembly Download PDF

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Publication number
EP2518341B1
EP2518341B1 EP10839696.1A EP10839696A EP2518341B1 EP 2518341 B1 EP2518341 B1 EP 2518341B1 EP 10839696 A EP10839696 A EP 10839696A EP 2518341 B1 EP2518341 B1 EP 2518341B1
Authority
EP
European Patent Office
Prior art keywords
sliding bearing
lubricant
lubricant storage
circumferential surface
area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP10839696.1A
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German (de)
English (en)
French (fr)
Other versions
EP2518341A4 (en
EP2518341A2 (en
Inventor
Chung Rae Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HD Hyundai Infracore Co Ltd
Original Assignee
Doosan Infracore Co Ltd
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Publication date
Application filed by Doosan Infracore Co Ltd filed Critical Doosan Infracore Co Ltd
Publication of EP2518341A2 publication Critical patent/EP2518341A2/en
Publication of EP2518341A4 publication Critical patent/EP2518341A4/en
Application granted granted Critical
Publication of EP2518341B1 publication Critical patent/EP2518341B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/103—Construction relative to lubrication with liquid, e.g. oil, as lubricant retained in or near the bearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
    • F16C33/1065—Grooves on a bearing surface for distributing or collecting the liquid

Definitions

  • the present invention relates to a sliding bearing and a sliding bearing assembly.
  • the present invention relates to a sliding bearing that is applied to a joint of a machine, fits on a shaft, and guides axial motion while supplying a lubricant, and a sliding bearing assembly.
  • sliding bearings fitting on a shaft for rotation, movement, and support are used for various joints throughout construction machines, hydraulic equipment, and machines.
  • a lubricant is supplied to the sliding contact surface between a shaft and the bearings supporting the shaft to prevent inner friction.
  • the lubricant is periodically supplied and forms a thin oil layer by flowing on the sliding contact surface between the shaft and the sliding bearing, as the shaft rotates and moves.
  • the oil layer may partially break when the apparatus stops or operates or variable load is applied to the apparatus from the outside, and the lubricant is exhausted and the oil layer becomes insufficient, when the sliding bearing is used for a predetermined period of time.
  • the contact pressure between the shaft and the sliding bearing increases and scorching and sticking is caused between the shaft and the sliding bearing by friction heat due to the contact pressure, thereby increasing the amount of wear.
  • the conditions of surface pressure and speed of the sliding bearing that is used for various joints with the phenomenon are very various and there is a limit in fitting the conditions of surface pressure and speed within all ranges for one type of sliding bearing to use. Therefore, it is important to reduce scorching and sticking and wear between the shaft and the bearing by disposing an optimal applicable product in the right place within a predetermined range of surface pressure and speed. Further, it is necessary to increase a supply time for the sliding bearing to keep the lubrication effect.
  • a bearing device configured to prevent scorching and sticking between the shaft and the sliding bearing is disclosed in Korean Patent Application Laid-Open No. 2006-0070264 .
  • a shaft is formed in a hollow body with a space to store a lubricant therein such that the storage amount of lubricant increases.
  • a plurality of holes for supplying a lubricant which are connected to the hollow body is formed in the shaft.
  • the storage for a lubricant formed in the shaft increases the time until the lubricant is exhausted, by increasing the amount of lubricant that is supplied to the sliding contact surface, and accordingly, the time of supplying the lubricant increases.
  • the rigidity is insufficient in some cases.
  • the bearing device disclosed in the Patent has a lubricant pocket on the surface sliding in contact with the shaft, in which the depth is 0.03mm to 0.3mm and the ratio of the pocket area to the pocket depth is about 10 to 40mm.
  • the lubricant in the pocket is supplied to the sliding contact surface in sliding, such that local oil layer cut is prevented.
  • the depth of the lubricant storage is too small in this configuration, such that the amount of lubricant that can be stored is small and the supply period cannot be extended.
  • JP 2009 024798 A relates to a sliding bearing comprising an inclined groove being formed on an inner peripheral surface of a bearing.
  • US 4342491 discloses a journal bearing which is self-lubricating under high load and temperature conditions.
  • the present invention provides a sliding bearing that can ensure scorching-sticking resistance and wear resistance by improving a lubrication property.
  • the present invention is directed to provide a sliding bearing that has a lubricant storage, not in a shaft, and does not generate local oil layer disconnection and an insufficient oil layer within a short time, by optimizing the ratio of the volume of the lubricant storage to the entire volume of the sliding bearing into a predetermined value and also optimizing the ratio of the area of the lubricant storage to a contact area between the shaft and the sliding bearing and a predetermined ratio of the area of the lubricant storage to the contact area between the sliding bearing and a boss on the sliding bearing.
  • an object of the present invention is to provide a sliding bearing that can ensure scorching-sticking resistance and wear resistance by improving a lubrication property.
  • an object of the present invention is to provide a sliding bearing having a lubricant storage having a predetermined area ratio and a predetermined volume ratio.
  • an object of the present invention is to provide a sliding bearing that can be effectively used under specific operating conditions, for example, a surface pressure condition of 100 to 1000 kg/cm 2 and a speed condition of 0.005 to 0.1m/sec.
  • the present disclosure provides a sliding bearing 100 having an inner circumferential surface 110 and an outer circumferential surface 150 in which the lubricant storage is formed at at least one of the inner circumferential surface 110 and the outer circumferential surface 150 and the ratio of the area of the lubricant storage to at least one of the inner circumferential surface 110 and the outer circumferential surface 150 is 15 to 60 %, wherein the grooves include at least one of dimple-shaped grooves having a circular groove-forming surface and pocket-shaped grooves having different axial lengths and circumferential lengths, wherein the dimple-shaped grooves and the pocket-shaped grooves are separated from each other.
  • the ratio of the area of the lubricant storage to at least one of the inner circumferential surface 110 and the outer circumferential surface 150 is 15 to 40%.
  • the sliding bearing may be efficiently used at a speed of 0.005 to 0.1 m/sec.
  • a first lubricant storage 120 is formed on the inner circumferential surface 110 and a second lubricant storage 160 is formed on the outer circumferential surface 150, and the ratio of the area of the first lubricant storage 120 to the inner circumferential surface 110 is 15 to 60% and the ratio of the area of the second lubricant storage 160 to the outer circumferential surface 150 is 15 to 40%.
  • the grooves may include arc groove 123 formed around a quarter of or the entire circumference of the inner circumferential surface in the circumferential direction with a uniform width.
  • the second lubricant storage 160 includes at least one or more of arc grooves 161 formed around a quarter of or the entire circumference of the outer circumferential surface in the circumferential direction with a uniform width.
  • the first lubricant storage 120 and the second lubricant storage 160 are connected with each other by connection through-holes 170 at at least two or more portions.
  • the volume defined by the first lubricant storage 120 and the second lubricant storage 160 is 5 to 30% of the entire volume of the sliding bearing 100.
  • the present disclosure also provides a sliding bearing assembly including the sliding bearing 100 described above, a shaft 200 rotatably fitting in the sliding bearing, and a boss 300 fitting on the sliding bearing from the outside of the sliding bearing.
  • the sliding bearing of the present disclosure has excellent scorching-sticking resistance and wear resistance, because the lubrication property is improved and it is correspondingly possible to reduce the contact pressure on the sliding surface without generating local oil layer cut or a deficit of a lubricant for a short time,
  • the sliding bearing according to the present disclosure is very useful particularly under the conditions of the surface pressure of 100 to 1000 kg/cm 2 and the speed of 0.005 to 0.1 m/sec.
  • a sliding bearing according to the present invention has a lubricant storage that can store a lubricant.
  • the lubricant storage is formed on the inner circumferential surface that is a contact surface that slides on a shaft fitting in the sliding bearing and an outer circumferential surface that is a contact surface that comes in contact with a boss fitting on the sliding bearing.
  • a sliding bearing 100 has an inner circumferential surface 110 and an outer circumferential surface 150 and can be used under a surface pressure of 100 to 1000 kg/cm 2 , in which the lubricant storage is formed at at least one of the inner circumferential surface 110 and the outer circumferential surface 150 and the ratio of the area of the lubricant storage to at least one of the inner circumferential surface 110 and the outer circumferential surface 150 is 15 to 60 % the grooves include at least one of dimple-shaped grooves having a circular groove-forming surface and pocket-shaped grooves having different axial lengths and circumferential lengths,wherein the dimple-shaped grooves and the pocket-shaped grooves are separated from each other.
  • the ratio of the area of the lubricant storage to at least one of the inner circumferential surface 110 and the outer circumferential surface 150 is 15 to 40%.
  • the sliding bearing is efficiently used at a speed of 0.005 to 0.1 m/sec.
  • FIG. 2 is an example of a sliding bearing according to the present invention and FIG. 3 is a view showing a cross-section of the sliding bearing taken in the axial direction of FIG. 2 .
  • the sliding bearing 100 shown in FIG. 2 has the inner circumferential surface 110 and the outer circumferential surface 150, a first lubricant storage 120 is formed on the inner circumferential surface 1110 and a second lubricant storage 160 is formed on the outer circumferential surface 150.
  • the area ratio of the first lubricant storage 120 formed on the inner circumferential surface 110 is 15 to 60% of the area of the inner circumferential surface 110 and the area ratio of the second lubricant storage 160 formed on the outer circumferential surface 150 is 15 to 40% of the area of the outer circumferential surface 150.
  • the inner circumferential surface of the sliding bearing of FIG. 2 generally comes in contact with a shaft, and when a lubricant storage (first lubricant storage 120) having an area corresponding to 15 to 60% of the area of the contact area is provided, a lubricant is sufficiently circulated in the sliding bearing and local oil cut is reduced.
  • a lubricant storage first lubricant storage 120
  • the area ratio is less than 15%, the entire lubricant circulation may be insufficient, such that local oil layer cut and heat generation ratio may increase. This phenomenon is generated even under the surface pressure condition of 100 to 1000 kg/cm 2 and the speed condition of 0.005 to 0.1 m/sec.
  • the outer circumferential surface of the sliding bearing generally comes in contact with the boss fitting on the sliding bearing, and the second lubricant storage 160 is formed in an area of 15 to 40% relative to the entire outer circumferential surface of the sliding bearing.
  • the second lubricant storage 160 is connected with the first lubricant storage 120 by at least two or more connection through-holes 170 and supplies the lubricant to the first lubricant storage 120, such that it is possible to sufficiently supply a lubricant even if the sliding bearing 100 operates for a long time.
  • the second lubricant storage 160 When the second lubricant storage 160 supplies a lubricant to the first lubricant storage, the shape of the second lubricant storage 160 and the angle of the outer circumferential surface 150 are not that important. Therefore, according to an example of the present invention, the second lubricant storage 160 may be formed in a simple shape such as an arc groove 161 formed around a quarter of or the entire circumference of the outer circumferential surface in the circumferential direction with a uniform width. Other shape of groove, for example, the rectangular groove 162 shown in FIG. 2 may be formed as the second lubricant storage 160.
  • the depth is determined in consideration of the rigidity, machining cost, and time of the sliding bearing 100, and according to the present invention, it is preferable make the depth 2/5 of the thickness of the sliding bearing 100.
  • the ratio of the area of the second lubricant storage 160 to the outer circumferential surface of the sliding bearing is less than 15%, the amount of stored lubricant to the installation cost of the lubricant storage is small and efficiency is low, it may be difficult to fix the sliding bearing with an external structure such as a boss because the area of the portion that comes in direct contact with the external structure such as a boss fitting on the sliding bearing even if the maximum tightening amount with over 40% of area ratio is set, such that the sliding bearing may be separated from the external structure such as a boss.
  • the first lubricant storage 120 is composed of a plurality of grooves formed on the inner circumferential surface and the grooves have at least two different shapes and are separated from each other. That is, the lubricant storage formed on the inner circumferential surface of the sliding bearing may have two or more separate shapes not connected with each other.
  • grooves constituting the first lubricant storage include at least one of dimple-shaped grooves 121 having a circular groove-forming surface and pocket-shaped grooves 122 having different axial lengths and circumferential lengths.
  • the first lubricant storage 120 formed on the inner circumferential surface 110 of the sliding bearing may be shaped to function as a channel for the lubricant and a lubricant storage, like the dimple-shaped groove 121 and the pocket-shaped groove 122.
  • the dimple-shaped groove 121 and the pocket-shaped groove 122 are separately shaped not to be connected with each other.
  • the grooves may include arc groove 123 formed around a quarter of or the entire circumference of the inner circumferential surface in the circumferential direction with a uniform width.
  • the arc groove 123 can smoothly function of a channel for the lubricant.
  • the lubricant storages not connected with each other can perform a function of reducing the actually applied surface pressure and a function of supplying the lubricant to the sliding contact surface.
  • the lubricant storage of the separate shape such that the ratio of the length of the axial direction z to the length of the circumferential direction ⁇ is less than 1 under the conditions of large load and low speed of the sliding bearing, and it is preferable to make the lubricant storage of the separate shape such that the ratio of the length of the axial direction z to the length of the circumferential direction ⁇ 0 or more under the conditions of small load and high speed.
  • the lubricant storage of the separate shape may be made such that the ratios of the axial length to the circumferential length are 0 or more and less than 1. This is in connection with the sliding direction and because the ratio of the axial length to the circumferential length less than 1 is advantageous for load-supporting force and the ratio of 0 or more is advantageous at high speed.
  • the volume defined by the first lubricant storage 120 and the second lubricant storage 160 is 5 to 30% of the entire volume of the sliding bearing 100. That is, the volumes of the lubricant storages 120 and 160 to the entire volume of the sliding bearing 100 are set such that the average volume per unit area is 5 to 30%.
  • the lubricant storage ensures a volume of 5 to 30% to the entire volume of the sliding bearing, it is possible to perform sufficient lubrication for a long time without local oil layer cut or a deficit of an oil layer on the contact surface of the sliding bearing.
  • the volume ratio of the lubricant storages 120 and 150 is less than 5%, the amount of lubricant is insufficient and scorching-sticking is easily generated within a short time, and when the volume ratio is over 30%, the entire rigidity of the sliding bearing is insufficient, such that deformation is easily generated. As a result, abnormal wear or scorching-sticking increases and breakage is easily generated, the supply time becomes very short under a sever condition.
  • the sliding bearing according to the present invention is useful particularly at the surface pressure of 100 to 1000 kg/cm 2 and the speed of 0.005 to 0.1 m/sec.
  • the present invention also provides a sliding bearing assembly including the sliding bearing 100 described above, a shaft 200 rotatably fitting in the sliding bearing, and a boss 300 fitting on the sliding bearing from the outside of the sliding bearing.
  • the sliding bearing assembly exemplified in FIG. 6 may be generally applied to joints of an excavator.
  • the sliding bearing assembly has a basic structure in which the sliding bearing 100 is forcibly fitted and supported in the boss 300 with dimensions of a predetermined-tightening amount, and the shaft 200 is fitted in the sliding bearing 100.
  • the first lubricant storage 120 composed of grooves having two or more different shapes is formed on the contact surface 110 on which the shaft 200 and the sliding bearing 100 slide to have an area ratio in the range of 15 to 60% to the entire sliding contact area
  • the second lubricant storage 160 is formed on the surface 150 where the sliding bearing 100 is forcibly fitted in contact with the boss 300 to have an area ratio to the entire contact area of 15 to 40%.
  • the second lubricant storage 160 is formed in an arc groove 161 machined in the circumferential direction.
  • the first lubricant storage 120 and the second lubricant storage 160 are connected through two or more connection through-holes 170, and the lubricant in the second lubricant storage 160 moves to the first lubricant storage 120, thereby supplying the lubricant.
  • the volume of the first lubricant storage and the second lubricant storage is set such that the average volume per unit volume of the sliding bearing is in the range of 5 to 30%.
  • First lubricant storages and second lubricant storages were formed in the standards of the following Table 1 in the sliding bearings manufactured as described above and they were applied to the first to seventh embodiments and first to fifth comparative examples.
  • each dimple-shaped groove 121 was formed to have an area of 200 mm 2 and a length of 1.5 mm and arc grooves were formed around the inner circumferential surface 110 to have a length in the range of 1 to 1.1 mm and a width of 7mm.
  • the cross-section of the second lubricant storage was a rectangle and formed in an arc groove 161 having a length in the range of 1.2 to 1.3 mm.
  • a sliding bearing assembly was formed by fitting a journal shaft having a diameter of 70mm in the sliding bearings 100 manufactured by Embodiments 1 to 7 and Comparative examples 1 to 5 and fitting a boss having a diameter of 85mm on the sliding bearing.
  • a grease that is a lubricant was supplied one time to the sliding contact surface which is the inner circumferential surface 110 of the sliding bearing and the outer circumferential surface of the journal shaft and a grease that is a lubricant was also supplied to the outer circumferential surface 150 of the sliding bearing.
  • the sliding bearing assembly is continuously operated under the condition of a vibration angle of 90° and the maximum vibration speed of 0.1 m/sec.
  • the load when scorching-sticking was generated was taken as a scorching-sticking load by applying predetermined load to the sliding bearing from the outside for every 1,000 cycles in the continuous operation. The result was shown in Table 2.
  • a supply cycle of how frequently a lubricant is injected, other than the scorching-sticking load, is very important for industrial equipment such as an excavator.
  • a supply cycle over 140 hours is required to be able to supply a lubricant every week.
  • the supply cycle increases with an increase in volume ratio of the lubricant storages.
  • the present invention is not limited to the joints of a working machine for excavating and may be applied to other equipment.
  • the sliding bearing according to the present invention can be applied to various joints of working machines and may be applied to construction and civil engineering machinery which is used, for example, under the conditions of a surface pressure 100 to 1000 kg/cm 2 and a speed of 0.005 to 0.1m/sec.
  • the sliding bearing according to the present invention is also applied to general machinery such as various hydraulic machines and a compressor in other industrial fields.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Sliding-Contact Bearings (AREA)
EP10839696.1A 2009-12-22 2010-12-08 Sliding bearing and sliding bearing assembly Active EP2518341B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020090129324A KR101747965B1 (ko) 2009-12-22 2009-12-22 슬라이딩 베어링 및 슬라이딩 베어링 조립체
PCT/KR2010/008729 WO2011078499A2 (ko) 2009-12-22 2010-12-08 슬라이딩 베어링 및 슬라이딩 베어링 조립체

Publications (3)

Publication Number Publication Date
EP2518341A2 EP2518341A2 (en) 2012-10-31
EP2518341A4 EP2518341A4 (en) 2017-08-02
EP2518341B1 true EP2518341B1 (en) 2018-10-10

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EP10839696.1A Active EP2518341B1 (en) 2009-12-22 2010-12-08 Sliding bearing and sliding bearing assembly

Country Status (5)

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US (1) US8708567B2 (zh)
EP (1) EP2518341B1 (zh)
KR (1) KR101747965B1 (zh)
CN (1) CN102667191B (zh)
WO (1) WO2011078499A2 (zh)

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Also Published As

Publication number Publication date
KR20110072413A (ko) 2011-06-29
CN102667191A (zh) 2012-09-12
EP2518341A4 (en) 2017-08-02
KR101747965B1 (ko) 2017-06-15
EP2518341A2 (en) 2012-10-31
WO2011078499A3 (ko) 2011-11-17
CN102667191B (zh) 2014-10-29
WO2011078499A2 (ko) 2011-06-30
US20120328224A1 (en) 2012-12-27
US8708567B2 (en) 2014-04-29

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